电气专业毕设英文文献(格式已修改)Word格式.docx
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电气专业毕设英文文献(格式已修改)Word格式.docx
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文献题目:
DirectTorqueControlofInductionMotorsUtilizingThree-LevelVoltageSourceInverters
文献作者:
XavierdelToroGarcia,AntoniArias,MarcelG.JayneandPhilA.Witting
文献来源:
IEEETrans.Ind.Electron,vol.51,No.4,pp.744–757
发表日期:
2004年8月
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英文原文:
DirectTorqueControlofInductionMotorsUtilizingThree-LevelVoltageSourceInverters
XavierdelToroGarcia,AntoniArias,MarcelG.Jayne,
andPhilA.Witting
Abstract—Anewcontrolstrategyforinductionmotorsbasedondirecttorquecontrolispresentedwhichemploysathree-levelinverterinsteadofthestandardtwo-levelinverter.Thecontrollerisdesignedtoachieveatorqueripplereductionbytakingadvantageoftheincreaseinthenumberofinverterstatesavailableinathree-levelinverter.Theharmonicdistortioninthestatorcurrentsandtheswitchingfrequencyofthesemi-conductordevicesarealsoreducedinthenewcontrolsystempresented.
IndexTerms—Inductionmotordrives,three-levelconverter,torquecontrol.
I.INTRODUCTION
Thestandardvoltagesourceinverter(VSI)traditionallyusedinelectricaldrivesystemsisthetwo-levelVSI,whichunfortunatelyhasanumberofinherentlimitations.Forexample,themaximumvoltagethatcanbesupportedbythesemiconductorswitchingdevicesintheVSIlimitsthemaximumvalueofdc-linkvoltage.Furthermore,theoutputvoltagesandcurrentsfromtheVSIcancontainhighharmonicdistortion.TheoutputvoltagewaveformscanalsocontainlargevaluesofdV/dt,whichcontributetothedegradationofthemachinewindingsinsulationandbearings,andalsoproduceconsiderableelectromag-neticinterferenceduringoperation.NewmultilevelVSItopologies,however,canconsiderablyreducemanyoftheselimitations[1].
Themostcommonlyusedmultileveltopologyisthethree-levelneutralpointclamped(NPC)VSI[2].ThistypeofVSIhasadvantagesoverthestandardtwo-levelVSI,suchasagreaternumberoflevelsintheoutputvoltagewaveforms,lessharmonicdistortion,andlowerswitchingfrequencies.
Directtorquecontrol(DTC)hasemergedtobecomeapossiblealternativetothewell-knownvectorcontrolstrategiesforinductionmotorcontrolsystems[3],[4].Althoughconsiderableresearchhasbeenmadeintothetwo-leveltopologiesassociatedwiththismethodofcontrol,theamountofresearchcarriedouttodateintoDTCsystemsemployingmultileveltopologiesisstillratherlimited.Themajoradvantageofthethree-levelVSItopologywhenappliedtoDTCistheincreaseinthenumberofvoltagevectorsavailable.Thismeansthenumberofpossibilitiesinthevectorselectionprocessisgreatlyincreasedandleadstoamoreaccuratecontrolsystem,whichcanresultinareductionofthetorqueandfluxripples.Thisisofcourseachievedattheexpenseofanincreaseinthecomplexityofthevectorselectionprocess.AlthoughseveralauthorshaverecentlyproposedtheimplementationofDTCutilizingthishigher-leveltopology,theirapproachesarebasedontheuseofmorecomplexvectorselectiontablescombinedwithmodulationtechniquesbasedonanalyticalmethodswhichhavemachineparameterdependency[5][6].Adifferentapproachisaselectiontablebasedontheconceptofvirtualvectors[7].ThesenewmethodsconsiderablyincreasethecomplexityofthecontrolstrategywhencomparedtotheclassicalDTCsystem[3],andtheycannotbeextendedtodifferentmultileveltopologieswithahighernumberoflevelsbecauseofthetableselectionmethodadopted.
Fig.1.Schematicdiagramofthenewcontroller.
ThispaperdescribesacontrollerbasedonDTCthatcanbeappliedtodifferentmultilevelVSItopologies.Itavoidstheuseofhysteresiscomparatorsandlook-uptables,anditdoesnotrequiretheknowledgeofthemotormodelinthecontrolsystemexceptfortheinherentestimatorasintheclassicalDTCsystem.
II.NEWCONTROLLER
ThegeneralstructureofthenewcontrollerisshowninFig.1.Thisnovelcontrollergeneratesareferencestatorvoltagevector(u∗s)inα–βcoordinates(usα,usβ)accordingtotheDTCbasicprinciple,ratherthanusingtheVSIstatelook-uptableasusedinclassicalDTC.ThisapproachadoptedisclosetotheDTCwithspacevectormodulationschemewithclosed-loopfluxandtorquecontrol,andstatorfluxorientedcontrol[4].Morerecently,othersimilarmethodsbasedonthepredictivetorquecontrolconcepthaveappeared[8][9].
Theinputstothecontrollerarethestatorfluxerror(eψs),thetorqueerror(eΓe)and,additionally,thestatorfluxangularspeed(ωB),whichisobtainedtoincorporatethebackelectromotiveforce(BEMF)termtoimprovethetorqueresponseatdifferentoperatingpoints.Thereferencevoltagevectorcalculatedbythecontrollercanbesynthesizedusingdifferenttechniqueswithdifferentdegreesof
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